“…Different techniques have been used such as visual tracking [Harvey, 19601, quantitative spectrophotometry [Sokoloski et al, 1977;Hartmann et al, 1983;Craig et al, 1983;Paquignon et al, 1983;Ross et al, 1983;Sat0 et al, 19841, photomicrographic approaches including single time-exposure photomicrography, microcinematographic and videomicrographic analyses [Makler, 1978;Makler et al, 1979;David et al, 1981;Kamidono et al, 1983;Acott et al, 1983;Overstreet, 1979, 19811, andcomputer determination [Amann andHammerstedt, 1980;O'Connor et al, 19811.…”